SRTM DEM derived 18 degree or greater - SRTM18

Slopes greater than or equal to 18 degrees derived from the 1 second Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM).\r\nThe SRTM >18 layer is a component used in the Native Vegetation Regulatory Map vulnerable lands layer. The Shuttle Radar Topographic Mission DEM derived 18 degree or higher layer is a raster (30 metre pixel) image. The Shuttle Radar Topographic Mission was flown in February 2000 and captured global elevation information between latitudes of 60 degrees North to 56 degrees south at 1 arcsecond resolution. This data has been processed to calculate slope based on a 3 by 3 pixel moving window and resampled to 30m. All values greater than or equal to 18 degrees have been extracted and flattened to produce the SRTM>18 layer described here.\r\nMore information regarding the Vulnerable Lands Layer may be found at: https://datasets.seed.nsw.gov.au/dataset/nvr-map-vulnerable-regulated-land-2022\r\n\r\nLast updated 28 February 2000.\r\n\r\n

本数据集基于1秒分辨率航天飞机雷达地形测绘任务（Shuttle Radar Topography Mission, SRTM）数字高程模型（Digital Elevation Model, DEM），提取坡度大于等于18度的区域生成。
SRTM>18图层是原生植被监管地图脆弱用地图层的组成组件之一。该基于航天飞机雷达地形测绘任务DEM生成的坡度≥18度图层为像素分辨率30米的栅格（raster）影像。
航天飞机雷达地形测绘任务于2000年2月执行，以1角秒的分辨率获取了北纬60度至南纬56度之间的全球高程数据。本数据通过3×3像素移动窗口计算坡度，并重采样至30米分辨率，随后提取所有坡度大于等于18度的区域并进行扁平化处理，最终生成本次所述的SRTM>18图层。
有关脆弱用地图层的更多信息可访问：https://datasets.seed.nsw.gov.au/dataset/nvr-map-vulnerable-regulated-land-2022

最后更新时间：2000年2月28日。